Astrophysics (index)

Gas Fraction Estimation

(methods of estimating various amounts of gas in galaxies)

Gas Fraction Estimation is the use of formulae (models) to estimate the gas (Gas Fraction) or kinds of gas in, for example, a Galaxy. Such a method may be used with survey data to perform such estimates on a large number of bodies using available data. Example (using Sloan Digital Sky Survey (SDSS) data):

log10(GHI/S) = - 1.73238(g - r) + 0.215182μi - 4.08451

where:

  • GHI is HI gas the galaxy.
  • S is the stellar mass of the galaxy.
  • μi is the i-band surface brightness.
  • g and r are the corresponding Passband Magnitudes.

Methods are devised for different Redshifts (z), in particular to identify Star Formation (SF) potential.


(hydrogen,HI,gas,mass)
http://adsabs.harvard.edu/abs/2009MNRAS.397.1243Z

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